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<p>Folks,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_October_10,_2018#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>______________________________</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">Minutes, GlueX TOF Meeting, October 10, 2018</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> JLab: </b> Thomas Britton, Ashley Ernst, Mark
Ito (chair), Simon Taylor, Beni Zihlmann</li>
</ul>
<p>There is a recording of this meeting on the <a
rel="nofollow" class="external text"
href="https://bluejeans.com/s/WUrPO/">BlueJeans site</a>.
Use your JLab credentials to access it.
</p>
<h3><span class="mw-headline" id="Announcement">Announcement</span></h3>
<p>Ashley will be taking on the role of FSU TOF person at
JLab. To start, she is going to work on the calibration
of the Fall 2018 data. She has been talking to Beni
about this and reviewing the code. Great news!
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_August_15_meeting">Review
of minutes from the August 15 meeting</span></h3>
<p>We glanced at <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_August_15,_2018#Minutes"
title="GlueX TOF Meeting, August 15, 2018">the minutes</a>.
No significant comments were offered.
</p>
<h3><span class="mw-headline" id="Calibration_Status">Calibration
Status</span></h3>
<ul>
<li> Sean Dobbs has written the group: TOF calibration
skims are ready.</li>
<li> Beni reports that the Spring 2018 TOF constants are
not doing too badly with the Fall 2018 data as judged
from monitoring plots.</li>
</ul>
<h3><span class="mw-headline" id="Upgrade_Plan">Upgrade
Plan</span></h3>
<p>We skimmed through <a rel="nofollow" class="external
text"
href="https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3777">the
talk Paul Eugenio gave</a> at the collaboration
meeting on re-configuring the inner portion of the TOF.
In it, he showed an "Option #2" that is less different
from the current configuration than Option #1 presented
at a previous meeting. In particular, it simplifies the
design of a new light guide arrangement by having fewer
consecutive "half-width" paddles in the array. The cost
is also much less.
</p>
<p>Beni is continuing study of the amplified base, but he
is not optimistic that it will solve our
high-rate-on-inner-counters problem.
</p>
<p>We all agreed that Option #2 has a lot to recommend it
and should be pursued immediately. Mark will talk to
Paul to get more details on how to proceed.
</p>
<h3><span class="mw-headline"
id="Lucite_Shield_and_Geometry">Lucite Shield and
Geometry</span></h3>
<p>Thomas reported a visit he received from Jon Zarling
asking about whether or not the Lucite shield was
present in the Monte Carlo. Jon is doing an FCAL
efficiency study for data and for Monte Carlo and the
shield could affect things. At one point Thomas had put
the shield into the geometry and run Monte Carlo with
the revised geometry, but that study did not get
completed.
</p>
<p>Ashley was tasked with picking up where Thomas left of
and finish putting the shield in the standard geometry.
</p>
<p>Beni recalled that Brad Cannon had presented, at a
Collaboration Meeting, <a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3232">results
of rate studies</a> before and after installation of
the shield in the Hall. Mark remembered that Paul had
also <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_January_10,_2017#Lucite_Shield_Results"
title="GlueX TOF Meeting, January 10, 2017">presented
results</a> at a TOF meeting.
</p>
<h3><span class="mw-headline"
id="Working_Group_Re-Organization_and_Work_Packages">Working
Group Re-Organization and Work Packages</span></h3>
<p>We discussed <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3757">the
proposal from the Collaboration Board</a> on the
re-organization of working groups and the associated <a
rel="nofollow" class="external text"
href="https://halldweb.jlab.org/wiki-private/index.php/2018_Work_Packages">set
of work packages</a>. From the discussion:
</p>
<ul>
<li> As Mark mentioned at the collaboration meeting,
there is still a role for the individual detector
working groups on subjects from hardware to
calibration.</li>
<li> Thomas pointed out that a lot of the people who
might form the new PID working group are the same ones
attending the current TOF, Start Counter, and DIRC
working group meetings.</li>
<li> Beni suggested making a list of new grad students
to work on the packages.</li>
<li> The proposed work packages are of two types: (1)
detector-specific understanding of performance and (2)
an overall PID system. </li>
<li> PID for GlueX needs a global philosophy for
combining information from all detector elements. This
is a common practice across many experiments (Beni
described the Hermes scheme, Thomas the LHC-B scheme).</li>
<li> A new PID working group could design this system.
It should be formed with folks who have experience
with the idea. Until a design is in place, writing
detailed work packages staffed with "workers" might be
premature.</li>
<li> Thomas and Simon mentioned that there is already a
form of this idea in the PID FOM. It makes a combined
χ<sup>2</sup> from the TOF and tracking dE/dx
information.</li>
<li> Error estimation is essential as input to any
global scheme. Here the detector working groups might
be the best place to host the work.</li>
</ul>
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<pre class="moz-signature" cols="72">--
Mark Ito, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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